Double-layer photovoltaic modules

Abstract

The utility model provides a double-layer photovoltaic module, including a front battery layer and a back battery layer, the front battery layer and the back battery layer are stacked by frame support on both sides, and the two layers are spaced to form a cavity, the front battery layer includes a first light-transmitting plate, a first adhesive layer, a front battery string, a second adhesive layer and a second light-transmitting plate in sequence from bottom to top, and the back battery layer includes a third light-transmitting plate, a third adhesive layer, a back battery string, a fourth adhesive layer and a back reflective plate in sequence from top to bottom, the gaps between the battery cells in the front battery string and the gaps between the battery cells in the back battery string are arranged alternately, and a reflective layer is provided on the side wall of the cavity. The photovoltaic module of this structure can make the light between the gaps between the battery cells be incident and reflected for multiple times, realize the maximum utilization of light, and then bring more power generation gain.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic cells, in particular to a double-layer photovoltaic component. Background Art

[0002] For photovoltaic modules, continuously improving module power and module conversion efficiency is the goal that the industry has always pursued. In photovoltaic power generation, efficiency improvement technologies are roughly divided into optical gain and electrical gain. From the perspective of optical gain, since there are gaps between cells in photovoltaic modules, if the gaps between the module cells can be fully utilized, it is a simple and effective way to increase module power.

[0003] The currently commonly used technology for interstitial lighting in photovoltaic modules is to coat the back glass or the inner layer of the composite back panel with highly reflective materials or stick a reflective film on the back glass of the cell or the inner layer of the composite back panel. Although this method can reflect the interstitial lighting to the cell next to the gap to a certain extent, the utilization rate of the reflected light is relatively low and the gain brought is also very limited. Utility Model Content

[0004] The purpose of the utility model is to provide a double-layer photovoltaic module, which can make the light between the gaps of the battery sheets be incident and reflected for multiple times, so as to maximize the utilization of the light and bring more power generation gain.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a double-layer photovoltaic module, including a front battery layer and a back battery layer, the front battery layer and the back battery layer are stacked by the support of the frame on both sides, and the two layers are spaced to form a cavity, the front battery layer includes a first light-transmitting plate, a first glue layer, a front battery string, a second glue layer and a second light-transmitting plate in sequence from bottom to top, and the back battery layer includes a third light-transmitting plate, a third glue layer, a back battery string, a fourth glue layer and a back reflective plate in sequence from top to bottom, the gaps between the battery cells in the front battery string and the gaps between the battery cells in the back battery string are arranged alternately, and a reflective layer is provided on the side wall of the cavity.

[0006] As a further improved technical solution of the utility model, the back reflective plate is divided into a grid-shaped reflective area, the center of the grid is a transmissive area, a reflective layer is provided on the reflective area, the transmissive area is transparent, the transmissive area corresponds to the position of the battery cells in the back battery string, and the reflective area corresponds to the gap position of the battery cells in the back battery string.

[0007] As a further improved technical solution of the present invention, the first light-transmitting plate, the second light-transmitting plate and the third light-transmitting plate are made of fully transparent materials, and the light transmittance is 90%-94%.

[0008] As a further improved technical solution of the utility model, a lead hole is provided on the second light-transmitting plate, and the lead is connected to the junction box.

[0009] As a further improved technical solution of the utility model, a lead hole is opened on the reflective area of ​​the rear reflective plate, and the lead is connected to the junction box.

[0010] As a further improved technical solution of the present invention, the first light-transmitting plate has the same thickness as the third light-transmitting plate, and the second light-transmitting plate has the same thickness as the back reflective plate.

[0011] As a further improved technical solution of the present invention, the thickness of the second light-transmitting plate is greater than that of the first light-transmitting plate.

[0012] As a further improved technical solution of the utility model, the frame includes an upper fixed groove, a partition portion and a lower fixed groove, the front battery layer is arranged in the upper fixed groove, the back battery layer is arranged in the lower fixed groove, and the first light-transmitting plate and the third light-transmitting plate are supported and isolated by the partition portion.

[0013] As a further improved technical solution of the utility model, the first adhesive layer, the second adhesive layer, the third adhesive layer and the fourth adhesive layer have the same thickness and the same material.

[0014] As a further improved technical solution of the utility model, a reflective layer is provided on the side wall of the junction box.

[0015] The double-layer photovoltaic module of the present invention adopts a double-sided, double-layer battery module structure. By staggering the gaps between the battery cells in the front battery string and the gaps between the battery cells in the back battery string, the light entering the gaps in the front battery string is transmitted to the surface of the battery cells in the back battery string for direct use. Because the reflection area of ​​the back reflective plate corresponds to the gap position of the battery cells in the back battery string, the light transmitted to the gaps in the back battery string is reflected to the back of the battery cells in the front battery string for use. In this way, the gap light can be used multiple times, which not only increases the power of the front battery string, but also increases the power of the back battery string. For conventional modules of the same size, the photovoltaic module of the present application improves the gain of the gap between the battery cells. In addition, with the frame and the cavity between the front and back layers of batteries, the light projected to the reflective layer of the side wall of the cavity can be reflected to the front battery string and the back battery string for reuse, further increasing the reflection utilization of the light entering the cavity, achieving maximum utilization of the light, and thus improving the power gain of the photovoltaic module as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall schematic diagram of the photovoltaic module of the utility model.

[0017] Figure 2 This is a schematic diagram of the front battery layer structure of the utility model.

[0018] Figure 3This is a schematic diagram of the front battery string structure of the utility model.

[0019] Figure 4 This is a schematic diagram of the back battery layer structure of the utility model.

[0020] Figure 5 It is a schematic diagram of the second light-transmitting plate of the utility model.

[0021] Figure 6 It is a schematic diagram of the back reflective plate of the utility model. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should also be noted that, for the convenience of description, the accompanying drawings only show parts related to the utility model rather than all structures.

[0023] Reference Figure 1-Figure 4 The double-layer photovoltaic module of this embodiment includes a front battery layer 1 and a back battery layer 2. The front battery layer 1 and the back battery layer 2 are supported and stacked by frames 3 on both sides, and a cavity 4 is formed in the middle of the two layers. A reflective layer is provided on the side wall of the cavity. The setting of the cavity 4 is not only beneficial to the reflection of light, but also has a sound insulation effect. It is not only suitable for ordinary places, but also for places with sound insulation requirements such as photovoltaic curtain walls. In this embodiment, "upper" corresponds to the front side of the photovoltaic module, and "lower" corresponds to the back side of the photovoltaic module. The front battery layer 1 includes a first light-transmitting plate 11, a first adhesive layer 12, a front battery string 13, a second adhesive layer 14, and a second light-transmitting plate 15 from bottom to top. The back battery layer 2 includes a third light-transmitting plate 21, a third adhesive layer 22, a back battery string 23, a fourth adhesive layer 24, and a back reflective plate 25 from top to bottom. The front battery string 13 and the back battery string 23 are a plurality of bifacial battery cells connected in series. The gap A1 of the battery cells in the front battery string 13 and the gap B1 of the battery cells in the back battery string 23 are arranged alternately. Figure 1 The gap A1 of the front battery cell and the gap B1 of the back battery cell are staggered in position, and preferably the gap B1 of the back battery cell corresponds exactly to the middle position of the front battery cell.

[0024] Specifically, the first light-transmitting plate 11, the second light-transmitting plate 15, and the third light-transmitting plate 21 are made of fully transparent materials. The first light-transmitting plate 11 and the third light-transmitting plate 21 have the same thickness and material. Ultra-thin glass or other transparent substrates with a light transmittance of 90%-94% can be selected. The thickness of the ultra-thin glass can be selected in the range of 1.0 to 1.6 mm. Both physical semi-tempered and chemically tempered can be selected. Other transparent substrates can be transparent back plates made of PET material and 0.3 to 0.45 mm thick, or films made of PVDF material and 50 to 100 um thick. When using these two types of transparent substrates, a transparent carrier plate needs to be placed underneath as a carrier. The second light-transmitting plate 15 and the back reflective plate 25 are high-transmittance glass plates with the same thickness and a light transmittance of 90%-94%, with a thickness range of 2.0 to 3.2 mm. The second light-transmitting plate 15 is thicker than the first light-transmitting plate 11.

[0025] Further, refer to Figure 4 and Figure 6 The back reflective plate 25 is divided into a grid-shaped reflective area 251, the center of the grid is a transmission area 252, a reflective layer is provided on the reflective area 251, the transmission area 252 is transparent, the light transmittance of the transmission area 252 is 90%-94%, the reflectivity of the reflective area 251 is 40%-80%, the transmission area 252 corresponds to the battery cell position in the back battery string 23, and the reflective area 251 corresponds to the gap B1 position of the battery cell in the back battery string 23.

[0026] The first adhesive layer 12, the second adhesive layer 14, the third adhesive layer 22, and the fourth adhesive layer 24 have the same thickness and material, and can be made of high-transmittance photovoltaic adhesive films such as EVA / POE / EPE for photovoltaic use, with a thickness range of 0.35-0.45 mm and a transmittance requirement of 90-94%.

[0027] Reference Figure 5 and Figure 6 A lead hole 100 is provided on the reflective area 251 of the second light-transmitting plate 15 and the back reflective plate 25 for the lead to pass through, and the lead is connected to the junction box 200. A reflective layer is provided on the side wall of the junction box 200, which can reflect the light irradiated on the surface of the junction box 200 to the surface of the battery cell of the front battery string 13, thereby bringing a gain in the power of the component.

[0028] In addition, the frame 3 includes an upper fixed groove 31, a partition portion 32 and a lower fixed groove 33. The front battery layer 1 is arranged in the upper fixed groove 31 and fixed by sealing glue. The back battery layer 2 is arranged in the lower fixed groove 33 and fixed by sealing glue. The first light-transmitting plate 11 and the third light-transmitting plate 21 are supported and isolated by the partition portion 32. The side wall of the partition portion 32 is subjected to high-reflection treatment, and a reflective layer is formed on the surface.

[0029] Reference Figure 1In the light reflection path, the gap A1 of the battery cells in the front battery string 13 and the gap B1 of the battery cells in the back battery string 23 are arranged alternately. The light entering the gap A1 of the front battery string 13 through the second light-transmitting plate 15 is transmitted to the surface of the battery cells in the back battery string 23 for direct utilization. Because the reflection area 251 of the back reflective plate 25 corresponds to the gap B1 position of the battery cells in the back battery string 23, the light transmitted to the gap B1 of the back battery string 23 is reflected to the back of the battery cells in the front battery string 13 for utilization. This not only increases the power of the front battery string 13, but also brings additional power to the back battery string 23. For conventional components of the same size, the photovoltaic component of the present application can bring more power gain and more power generation benefits. In combination with the reflective layer on the side wall of the cavity 4, the light incident on the reflective layer on the side wall of the cavity 4 can be reflected to the front battery string 13 and the back battery string 23 for reuse, further increasing the reflection utilization of the light entering the cavity 4.

[0030] In addition, the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technical personnel in the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, ordinary technical personnel in the field should understand that the technical personnel in the relevant technical field can still modify or make equivalent substitutions to the present invention, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A double-layer photovoltaic module, characterized in that: The invention comprises a front battery layer and a back battery layer, which are stacked by being supported by the frames on both sides, and a cavity is formed in the middle of the two layers. The front battery layer comprises a first light-transmitting plate, a first adhesive layer, a front battery string, a second adhesive layer and a second light-transmitting plate in sequence from bottom to top, and the back battery layer comprises a third light-transmitting plate, a third adhesive layer, a back battery string, a fourth adhesive layer and a back reflective plate in sequence from top to bottom. The gaps between the battery cells in the front battery string and the gaps between the battery cells in the back battery string are arranged alternately, and a reflective layer is provided on the side wall of the cavity.

2. The double-layer photovoltaic module according to claim 1, characterized in that: The back transflective plate is divided into a grid-shaped reflective area, the center of the grid is a transmissive area, a reflective layer is provided on the reflective area, the transmissive area is transparent, the transmissive area corresponds to the position of the battery cells in the back battery string, and the reflective area corresponds to the gap position of the battery cells in the back battery string.

3. The double-layer photovoltaic module according to claim 1 or 2, characterized in that: The first light-transmitting plate, the second light-transmitting plate and the third light-transmitting plate are made of fully transparent materials, and the light transmittance is 90%-94%.

4. The double-layer photovoltaic module according to claim 1, characterized in that: The second light-transmitting plate is provided with a lead hole, and the lead is connected to the junction box.

5. The double-layer photovoltaic module according to claim 2, characterized in that: A lead hole is provided on the reflective area of ​​the rear reflective plate, and the lead is connected to the junction box.

6. The double-layer photovoltaic module according to claim 1, characterized in that: The first light-transmitting plate has the same thickness as the third light-transmitting plate, and the second light-transmitting plate has the same thickness as the back reflective plate.

7. The double-layer photovoltaic module according to claim 6, characterized in that: The second light-transmitting plate is thicker than the first light-transmitting plate.

8. The double-layer photovoltaic module according to claim 1, characterized in that: The frame includes an upper fixing groove, a partition portion and a lower fixing groove, the front battery layer is arranged in the upper fixing groove, the back battery layer is arranged in the lower fixing groove, and the first light-transmitting plate and the third light-transmitting plate are supported and isolated by the partition portion.

9. The double-layer photovoltaic module according to claim 1, characterized in that: The first adhesive layer, the second adhesive layer, the third adhesive layer and the fourth adhesive layer have the same thickness and the same material.

10. The double-layer photovoltaic module according to claim 4 or 5, characterized in that: A reflective layer is provided on the side wall of the junction box.

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